package com.lin.eduservie.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.lin.eduservie.entity.EduSubject;
import com.lin.eduservie.entity.excel.SubjectData;
import com.lin.eduservie.service.EduSubjectService;
import com.lin.servicebase.exceptionhandler.GuliException;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData>{

    // 因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    // 不能实现数据库操作
    public EduSubjectService subjectService;
    public SubjectExcelListener() { }
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    // 读取excel内容，一行一行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if(subjectData == null){
            throw new GuliException(20001,"文件数据为空");
        }
        // 判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if(existOneSubject == null){ // 没有相同的一级分类，进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }
        // 添加二级分类
        String pid = existOneSubject.getId();
        EduSubject eduSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(),pid);
        if(eduSubject == null){ // 没有相同的二级分类，进行添加
            eduSubject = new EduSubject();
            eduSubject.setParentId(pid);
            eduSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(eduSubject);
        }
    }

    // 判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService eduSubjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    // 判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService eduSubjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
